CN109957712A - A kind of soft X70M line steel hot rolling coiled sheet and its manufacturing method - Google Patents

A kind of soft X70M line steel hot rolling coiled sheet and its manufacturing method Download PDF

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CN109957712A
CN109957712A CN201711333527.6A CN201711333527A CN109957712A CN 109957712 A CN109957712 A CN 109957712A CN 201711333527 A CN201711333527 A CN 201711333527A CN 109957712 A CN109957712 A CN 109957712A
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steel
rolling
soft
coiled sheet
temperature
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CN109957712B (en
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孔祥磊
黄国建
栗锐
吴成举
黄明浩
张英慧
王杨
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

Abstract

The present invention discloses a kind of soft X70M line steel hot rolling coiled sheet and its manufacturing method.Contain C 0.061%~0.080%, Si 0.15%~0.35%, Mn 1.41%~1.59%, Nb0.060%~0.080%, V 0.010%~0.030%, Ti 0.008%~0.020%, Mo0.13%~0.18%, Cr 0.13%~0.19%, Al 0.020%~0.060%, P≤0.018%, S≤0.004%, N≤0.007% in steel, and Pcm≤0.19%, remaining is Fe and inevitable impurity.Slab thickness 200mm or less.Slab is heated to 1150~1200 DEG C in 500~850 DEG C of hot chargings, and the finishing temperature of roughing is 980~1050 DEG C, and finish rolling start rolling temperature is 910~960 DEG C, and finishing temperature is 780~840 DEG C, 12~30 DEG C/s of cooling velocity, and coiling temperature is 470~530 DEG C.X70M grade hot-rolled sheet coil hardness number≤230HV of production10。

Description

A kind of soft X70M line steel hot rolling coiled sheet and its manufacturing method
Technical field
The invention belongs to metal material Aldecor fields, and in particular to a kind of pipe-line pipe line steel Manufacturing method, more particularly to API SPEC 5L specification in a kind of soft (≤230HV10) X70M Grade Pipeline Steel hot rolling Coiled sheet and its manufacturing method.
Background technique
Huge energy demand have stimulated the rapidly development of pipe-line construction, to ensure the stability and safety that convey, with The raising of understanding and the development of technology, are increasingly rationalized to the technical requirement of steel and perfect.Pipe line steel technical indicator is numerous, Such as tensile property, Charpy impact performance, block hammer performance, bending property, hardness, grain size, field trash, banded structure.
X70M grade of steel has become one of the mainstream grade of steel of domestic and international critical piping construction, and coiled sheet hardness number generally requires Maximum value 250HV10.There is engineering to propose tighter hardness requirement in order to ensure more preferably steel-pipe welding performance in recent years, X70 grades of pipe line steels are researched and developed there are many enterprise.
Application number 201310001803.4 discloses the cooling controlling and rolling controlling process of the coiled sheet of economical X 70 pipeline steel hot-rolling containing Cr. Ingredient contains in steel: C 0.05%~0.075%, Si 0.10%~0.35%, Mn 1.00%~1.65%, Nb 0.050% ~0.080%, Ti 0.010%~0.025%, Cr 0.30%~0.40%, use 8~10 passage roughing in technique, 300~ 400 DEG C are batched.Nb, V, Ti microalloying compound action cannot be given full play to without V in ingredient in the steel, reduces strengthening effect；It is high Cr easily causes hardness higher；Roughing passage is excessive, and reduction in pass is insufficient, influences original austenite refinement, and low temperature batches not only Hardness is high and easily causes scroll bad.
Application number 200410066297.8 discloses acicular ferrite type X70 pipe line steel and its system with high arrest toughness Make method.Ingredient contains C 0.02%~0.06%, Si 0.10%~0.50%, Mn 1.45% by mass percentage in steel ~1.75%, S≤0.002%, P 0.004%~0.012%, Nb 0.050%~0.080%, V 0.010%~ 0.060%, Ti 0.005%~0.025%, Mo 0.10%~0.30%, Cu≤0.30%, Ni≤0.30%, CaO 0.0015%~0.0040%, N≤0.008%, Al 0.015%~0.045%.C content is low in steel, adds to make up intensity The one or two of the alloying element for having added type more such as Cu or Ni, not only alloy system is complex and costly, in addition because not More valuable Mo is added to containing Cr, it is at high cost, P, S content controlled sternly, increase melting cost, therefore overall cost compared with It is high.
Application number 200810013479.7 discloses a kind of thick-specification high-tenacity X 70 acicular ferrite pipe line steel and manufacturer Method.Contain C 0.03%~0.06%, Si 0.15%~0.25%, Mn 1.55%~1.75%, S≤0.003%, P in steel 0.012%~0.020%, Nb 0.06%~0.08%, Ti 0.01%~0.02%, Mo 0.20%~0.30%, Cr 0.2%~0.35%, Cu 0.2%~0.35%.Mo, Cu noble element content are big in steel, at high cost, and Mo, Cr element integrally contain Amount is high, easily causes hardness number high, in addition only adds Cu without adding Ni, slab and is also easy to produce Cu crackle.
Application number 200710038397.3 discloses a kind of economical X 70 pipeline steel and its production method.The patent composition Middle C 0.015%~0.060%, Si≤0.30%, Mn 0.7%~1.80%, S≤0.005%, P≤0.015%, Nb≤ 0.15%, Ti 0.005%~0.020%, V≤0.08%, Mo≤0.50%, Cr≤0.50%, Cu≤0.60%, Ni≤ 0.60%.C content is low in steel, need to add more alloying elements to guarantee product strength, and cost is uneconomical, and practical with high Nb No V design, cannot give full play to Nb, V, Ti microalloying compound action.
Application number 201210022429.1 discloses a kind of high strength and low cost tenacity X 70 pipe line steel roll bending and its producer Method.In steel containing C 0.03%~0.07%, Si 0.10%~0.25%, Mn1.10%~1.80%, S≤0.005%, P≤ 0.018%, Nb 0.05%~0.10%, Ti0.008%~0.020%, Mo 0.05%~0.12%, Cr 0.15%~ 0.35%, Als0.020%~0.040%, Ca 0.0015%~0.0030%, N≤0.0060%.Without V, Bu Nengchong in ingredient Nb, V, Ti microalloying compound action are waved in distribution, reduce strengthening effect, and Mo content is relatively low, thus need to add more Cr with Intensity is supplemented, easily causes hardness number higher, in addition the steel takes low temperature to batch (350~450 DEG C), more low temperature phase changes easily generated Tissue causes hardness number higher.
At " steel research journal ", paper West-East National Gas Transmission Project heavy caliber X70 has been delivered in 2006,18 (3) by Zheng Lei, Gao Shan The development of gas transmission line coiled sheet, only clearly gives C, Mn ingredient in the paper, expensive including Mo, Ni, Cu etc. in other elements Heavy element, high expensive.
Though presently disclosed X70M Grade Pipeline Steel document and patent are more, it is related to the seldom of soft.It is published special Sharp document is first is that cause higher cost containing more noble element in alloy design, second is that adding more Cr or low temperature being taken to batch It is high that technique etc. causes hardness number, third is that not using the compound addition of Nb, V, Ti to expand the beneficial effect etc. of microalloy element.
Summary of the invention
The object of the present invention is to combine thermomechanical controlled rolling with the alloy system of economical rationality, provide a kind of with excellent Different comprehensive performance especially hardness number≤230HV10Low durometer X70M Grade Pipeline Steel hot-rolled sheet coil and its manufacturing method.
Specific technical solution is:
A kind of X70M Grade Pipeline Steel with acicular ferrite structure, constituent contain by mass percentage: C 0.061%~0.080%, Si 0.15%~0.35%, Mn 1.41%~1.59%, Nb 0.060%~0.080%, V 0.010%~0.030%, Ti 0.008%~0.020%, Mo 0.13%~0.18%, Cr 0.13%~0.19%, Al 0.020%~0.060%, P≤0.018%, S≤0.004%, N≤0.007%, surplus be Fe and inevitable impurity, and Pcm≤0.19%, wherein Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
The ingredient of X70M Grade Pipeline Steel of the present invention is designed using C-Mn-Nb-Mo system, while being handled using micro- Ti, in conjunction with Thermomechanical controlled rolling production technology obtains tiny acicular ferrite structure, to guarantee that product has excellent obdurability and lower Hardness number, the selection reason of essential element is as follows:
C: being most economical, most basic, most effective intensified element in steel, by solution strengthening and precipitation strength to raising steel Intensity have obvious effect, but excessively high carbon content adversely affects the impact flexibility, welding performance and hardness number of product. Therefore, carbon content control is 0.061%~0.080% by the present invention.
Si: deoxidant element is solid-solution in ferrite to improve the intensity of steel, but to lose plasticity and toughness simultaneously, the present invention Si content control be 0.15%~0.35%.
Mn: manganese has solution strengthening effect, can also reduce γ-α phase transition temperature, and then fining ferrite grains, mend simultaneously Repay the main and most economical intensified element for causing loss of strength because of C content reduction.High manganese promotes acicular ferrite nucleating, Steel yield strength and impact flexibility can be improved in high Mn/C, reduces ductile-brittle transition temperature, refines Carbonitride Precipitation size, promotes Precipitation strength effect, but the excessively high segregation of manganese content is serious, easily causes points hardness's value higher.Therefore, the present invention is by manganese content control It is made as 1.41%~1.59%.
Nb: being the main element that controlled rolling is carried out in modern microalloying pipe line steel, and NbC strain induced precipitate hinders The recovery and recrystallization of deformed austeaite reduces phase transition temperature, promotes the formation of acicular ferrite structure and the island M-A.Nb can pass through A variety of strengthening mechanisms such as refined crystalline strengthening, precipitation strength, precipitation strength, phase transformation strengthening improve the performance of steel, but Nb is noble element And it is no longer obvious to be added to a certain amount of rear strengthening effect.Therefore, content of niobium of the invention control is 0.060%~0.080%.
V: precipitation strength effect with higher and weaker refined crystalline strengthening effect, V mainly pass through C, N chemical combination in ferrite The precipitation of object plays invigoration effect, generally more preferable with the compound additive effect of Nb, Ti, containing micro addition general in the higher steel of Nb. Content of vanadium control of the invention is 0.010%~0.030%.
Ti: being strong nitrogen killer, and the stoichiometric ratio of Ti/N is 3.42.It, can be in slab when 0.015% or so Ti is added High-temperature stable tiny TiN precipitated phase is formed when continuous casting, this precipitated phase can effectively prevent continuous casting billet Ovshinsky during heating Body crystal grain is grown up, while having obvious effect to the fracture toughness for improving steel welding heat affected zone.Therefore, by Ti in the present invention Content is controlled 0.008%~0.020%.
Mo: effectively improving the harden ability of steel, expand γ phase region, and having reduces γ-α phase transition temperature, inhibits polygon iron element The formation of body (PF), promotes the transformation of acicular ferrite (AF), and improves the precipitation strength effect of Nb (C, N), improves steel Intensity and fracture toughness.Mo can significantly improve product obdurability by controlling phase transformation, but price is higher, and additive amount is excessively improved into This.Therefore, molybdenum content of the invention control is 0.13%~0.18%.
Cr: effectively improving harden ability, inhibits the generation of polygonal ferrite and pearlite, promotes in mild low-temperature space Form the transgranular ferrite or bainite for there are a large amount of dislocation distributions.Cr can significantly improve the tensile strength of product, but also obviously mention High rigidity, therefore should not add excessive.Chromium content control of the invention is 0.13%~0.19%.
Al: deoxidant element, the AlN particle of small and dispersed can be formed by adding suitable aluminium, be conducive to refine crystal grain, improved steel Toughness and tenacity.Al content of the invention is controlled 0.020%~0.060%.
P, S, N: being inevitable impurity element in steel, it is desirable to it is more lower better, but require too low to will increase production cost. Therefore, P, S, N are controlled as P≤0.018%, S≤0.004%, N≤0.007% in the present invention.
Pcm: control cold crack sensitivity coefficient is conducive to ensure the welding performance of product, therefore Pcm≤0.19% of the present invention.
The present invention also proposes that a kind of use medium thin slab continuous casting and rolling production technology economically fabricates X70M Grade Pipeline Steel The method of hot-rolled sheet coil.Its technological process of production is related to: molten iron pretreatment-converter smelting-external refining is (at RH+LF+ calcium Reason)-continuous casting-heating of plate blank-rolling-section cooling-batches.It is characterized in that:
(1) continuous casting process: molten iron pretreatment is smelted, converter smelting --- through top blast or top bottom blowing, the outer essence of furnace Refining --- through RH application of vacuum, the frivolous sulphuring treatment of LF furnace and Calcium treatment is carried out to control inclusion morphology and improves the extension of steel Property, toughness and cold-bending property；Continuous casting uses electromagnetic agitation or dynamic soft-reduction to improve the quality of continuous casting steel billet, slab thickness Hereinafter, its solidification cooling rate is far longer than traditional heavy slab, secondary dendrite spacing significantly reduces 200mm.
(2) rolling mill practice: continuous casting steel billet directly carries out hot charging stove heating in 500~850 DEG C of temperature, and continuous casting steel billet is through stepping Formula heating furnace is heated to 1150~1200 DEG C and comes out of the stove, and rolls after through roughing and mm finishing mill unit two-stage control, the finish to gauge of roughing Temperature is 980~1050 DEG C, and finish rolling start rolling temperature is 910~960 DEG C, and finishing temperature is 780~840 DEG C, and subsequent coiled sheet uses Section cooling mode is rapidly cooled with the speed of 12~30 DEG C/s, is batched at 470~530 DEG C.
X70M grade of steel hot-rolled sheet coil of the invention has excellent comprehensive performance: hardness number≤230HV10, yield strength Rt0.5For 500~600MPa, tensile strength RmFor 610~690MPa, elongation percentage A50mm>=30%, -30 DEG C of Charpy-V impact power Akv≥ 240J (3 sample means), -20 DEG C of drop hammer test section of shear >=90% (2 sample means).
The utility model has the advantages that
The present invention compared with the existing technology, has the beneficial effect that:
(1) present invention is the X70M Grade Pipeline Steel designed using C-Mn-Nb-Mo system, and alloy designs economical rationality, is free of Ni, Cu, noble element are added on a small quantity or are not added, and production cost is low；
(2) medium thin slab short route continuous casting and rolling process for production is combined to be rolled into coiled sheet, product group is woven to uniformly tiny Acicular ferrite structure, obdurability matching is good, the low (≤230HV of hardness number10), fully meet API SPEC 5L specification and in The requirement of petrochemical industry general technical specifications, is made welded tube by spiral submerged arc welded mode, can be widely applied to transportation pipe in petroleum In road construction, have economic benefit outstanding and good social benefit.
Detailed description of the invention
Fig. 1 is the optical microstructure of embodiment 1, and tissue is acicular ferrite structure in figure.
Specific embodiment
For following embodiment for illustrating the content of present invention, these embodiments are only the general description of the content of present invention, The content of present invention is not limited.
Table 1 is the chemical component of embodiment steel.Its process flow is molten iron pretreatment-converter smelting-external refining (RH + LF+ Calcium treatment)-continuous casting-heating of plate blank-rolling-section cooling-batches, and embodiment steel concrete technology system is shown in Table 2. Table 3 is the mechanical property of embodiment steel.
The chemical component wt, % of 1 embodiment steel of table
Embodiment C Si Mn P S Nb V Ti Mo Cr Al N Pcm
1 0.068 0.24 1.48 0.012 0.002 0.076 0.011 0.016 0.14 0.17 0.044 0.003 0.17
2 0.075 0.21 1.42 0.013 0.003 0.070 0.019 0.015 0.15 0.16 0.034 0.003 0.17
3 0.062 0.16 1.58 0.012 0.003 0.061 0.020 0.009 0.16 0.13 0.042 0.005 0.17
4 0.067 0.29 1.50 0.015 0.002 0.068 0.019 0.014 0.18 0.15 0.050 0.003 0.17
5 0.079 0.22 1.53 0.014 0.003 0.071 0.029 0.019 0.15 0.14 0.033 0.006 0.18
6 0.071 0.25 1.46 0.017 0.003 0.079 0.018 0.017 0.14 0.18 0.045 0.004 0.17
Note: Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B
2 embodiment steel process system of table
3 embodiment steel mechanical property of table
Note: the sampling direction of tension test, Charpy-type test and drop hammer test sample is and rolling direction is at 30 ° Direction.
By 1~table of table 3 as it can be seen that using present invention process produce X70 grade line steel hot rolling coiled sheet, hardness number≤ 230HV10, elongation percentage >=30%, -30 DEG C of Charpy-V impact power (3 sample means) Akv >=240J, -20 DEG C of drop hammer test The section of shear (2 sample means) >=90%, steel plate have good comprehensive mechanical property.

Claims (3)

1. a kind of soft X70M line steel hot rolling coiled sheet, which is characterized in that chemical component contains by mass percentage in steel: C 0.061%~0.080%, Si 0.15%~0.35%, Mn 1.41%~1.59%, Nb 0.060%~0.080%, V 0.010%~0.030%, Ti 0.008%~0.020%, Mo 0.13%~0.18%, Cr 0.13%~0.19%, Al 0.020%~0.060%, P≤0.018%, S≤0.004%, N≤0.007%, surplus be Fe and inevitable impurity, and Pcm≤0.19%, wherein Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
2. a kind of soft X70M line steel hot rolling coiled sheet as described in claim 1, which is characterized in that the hardness of hot-rolled sheet coil Value≤230HV10。
3. a kind of manufacturing method of soft X70M line steel hot rolling coiled sheet as claimed in claim 1 or 2, the production work of steel plate Skill are as follows: molten iron pretreatment-converter smelting-external refining-continuous casting-heating of plate blank-rolling-section cooling-batches, It is characterized in that,
Smelt: external refining is using RH application of vacuum, the frivolous sulphuring treatment of LF furnace and carries out Calcium treatment；Continuous casting using electromagnetic agitation or Dynamic soft-reduction, slab thickness 200mm or less；
Rolling: continuous casting steel billet directly carries out hot charging stove heating in 500~850 DEG C of temperature, is heated to 1150~1200 DEG C and comes out of the stove, with It is rolled by roughing and mm finishing mill unit two-stage control, the finishing temperature of roughing is 980~1050 DEG C, and finish rolling start rolling temperature is 910~960 DEG C, finishing temperature be 780~840 DEG C, subsequent coiled sheet use section cooling mode with the speed of 12~30 DEG C/s into Row is quickly cooled down, and is batched at 470~530 DEG C.
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CN110777296A (en) * 2019-10-08 2020-02-11 鞍钢股份有限公司 Ultra-thick X52 pipeline steel hot-rolled coil and production method thereof
CN111057954A (en) * 2020-01-02 2020-04-24 鞍钢股份有限公司 High-strength pipeline rolled plate for large thick wall acidity and manufacturing method thereof
CN111154963A (en) * 2019-12-26 2020-05-15 钢铁研究总院 Welding heat influence region-resistant softened submarine pipeline steel and preparation method thereof
CN111270156A (en) * 2020-03-18 2020-06-12 本钢板材股份有限公司 Production process of hot-rolled X70 pipeline steel with thickness specification of 20.0-25.4 mm
CN109957712B (en) * 2017-12-14 2020-09-01 鞍钢股份有限公司 Low-hardness X70M pipeline steel hot-rolled plate coil and manufacturing method thereof
CN111893401A (en) * 2020-08-03 2020-11-06 鞍钢股份有限公司 L450MS pipeline steel with excellent SSCC resistance under high loading stress and manufacturing method thereof
CN111996448A (en) * 2020-08-03 2020-11-27 鞍钢股份有限公司 L485MS pipeline steel with excellent SSCC (stress induced cracking) resistance under high loading stress and manufacturing method thereof
CN111996461A (en) * 2020-09-07 2020-11-27 鞍钢股份有限公司 X70 pipeline coiled plate for microalloyed resistance welded pipe and production method thereof
CN114774659A (en) * 2022-05-25 2022-07-22 新疆八一钢铁股份有限公司 Manufacturing method of microalloy steel coil for petroleum and natural gas conveying pipeline
WO2024002220A1 (en) * 2022-06-29 2024-01-04 宝山钢铁股份有限公司 High frequency resistance welded steel pipe and preparation method therefor

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